Which of these browsers is open source software?

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When it comes to web browsing, there are numerous browsers available, each with its own set of features and functionalities. One important aspect to consider when choosing a browser is whether it is open source software. Open source software refers to software whose source code is freely available, allowing users to study, modify, and distribute it. In this article, we will explore some popular browsers and determine which ones are open source software.

Google Chrome

Google Chrome is a widely used web browser developed by Google. While it is based on the open source Chromium project, Chrome itself is not fully open source. The Chromium project, on the other hand, is an open source project that serves as the foundation for many browsers, including Chrome. The source code for Chromium is freely available, allowing developers to modify and build upon it.

Mozilla Firefox

Mozilla Firefox is another popular web browser known for its focus on privacy and customization. Unlike Chrome, Firefox is fully open source. Its source code, known as Mozilla Firefox Source Code, is publicly available and can be accessed on the Mozilla website. This openness allows users and developers to examine the code, contribute to its development, and create their own versions of the browser.


Brave is a relatively new browser that has gained popularity for its emphasis on privacy and ad-blocking features. It is based on the Chromium project, similar to Chrome, but with additional privacy-focused enhancements. Brave is also an open source browser, with its source code available on the Brave GitHub repository. This allows users to audit the code and ensure that their privacy is being protected.


Opera is a long-standing browser that has undergone several transformations over the years. It is based on the Chromium project and shares many similarities with Chrome. While Opera is not fully open source, some components of the browser are open source. The Opera source code, known as Opera Presto, was open source until version 12.18. However, the current versions of Opera are not fully open source.


In conclusion, when it comes to open source browsers, Mozilla Firefox and Brave are the leading choices. Firefox is fully open source, allowing users to examine and modify the source code. Brave, on the other hand, is based on the open source Chromium project and has additional privacy-focused enhancements. While Google Chrome and Opera are popular browsers, they are not fully open source, although Chrome is based on the open source Chromium project.


– Mozilla Firefox Source Code: developer.mozilla.org/en-US/docs/Mozilla/Developer_guide/Source_Code
– Brave GitHub repository: github.com/brave/brave-browser
– Chromium project: chromium.org/Home